Topology and routing (2)
Components that have a defined position (e.g. Fixings, Grommets, Channels) are placed on the topology with a Fixing_assignment (in contrast to components that are placed on an area e.g. Wire_protections).
The model explicitly allows the definition of more than on Fixing_assignment for a component. This is necessary for components that have more than one defined position in the topology, e.g. channels where each entry of the channel is placed. The semantics here is, that all Fixing_assignments are valid, if the associated component exists in a harness variant.
For an illustrated example of the principle see https://ecad-wiki.prostep.org/specifications/vec/guidelines/placement-and-dimensions/